To provide a secondary battery in which irreversible capacity generated on a negative electrode surface is reduced, and a method for producing carbon-based negative electrode material suitable for use in the secondary battery.

A negative electrode of a secondary battery is formed of: graphite in which a G_s value (G_s=H_sg/H_sd) is 10 or less in a surface enhanced Raman spectroscopy spectrum; graphite having at least two peaks on a differential TG curve; graphite having saturated tap density of 1.0 g/cc or more; graphite with a filling-related index of 0.42 or more; or graphite having specific surface area ratio between after pressing and before pressing during pressure molding of 2.5 or less. The graphite material can be obtained by mixing carbon-based material with coating material such as pitch or by applying heat treatment to the carbon-based material in an oxidizing atmosphere and then applying graphitization.